It is desired to estimate the average time it takes statistics students to finish a computer project to within two hours at 90% reliability. it is estimated that the standard deviation of the times is 14 hours. how large a sample should be taken to get the desired interval? a) n = 189 b) n = 133 c) n = 325 d) n = 231

The bottom of ignacio's desktop is 74.5cm from the floor. ignacios sits in his adjustable chair, and the tops of his legs are 49.3cm from the floor. each clockwise rotation of the knob on the chair raises ignacio's legs by 4.8cm. write an inequality to determine the number of clockwise rotations, r, ignacio could make with the knob without his legs touching the desk.